Next to fit the page height you need to increase the canvas size of the scaled 4.375 x 5.469 image to 8.625 by increasing the canvas size: http://super.nova.org/EDITS/Scale3.jpg
What you will wind up with is your photo dimension (showing in red) centered in 4.375 x 8.625 page:
Just scale it to whatever size you want in the first scaling step (i.e. use 4" wide instead of 4.375). When you increase the canvas size it will put equal margins on each side.
Got it! Thank you very much..I am shooting at this cool jazz club and found these books the owner had made..they are like mini menu's wrapped in leather with each page perfect to mount a photograph..
I took a couple and am making him mini print books of works I have shot and framed at the club..